JPH0679199A - Displaying method for remaining time in centrifugal machine - Google Patents

Abstract

PURPOSE:To find the remaining time of operation accurately by deducting the centrifugal amount in the centrifugal separation from the centrifugal amount preset by a user, dividing the value by the square of the number of rotations operated to compute the remaining time of operation and displaying the time. CONSTITUTION:In the method in which conditions are set by omega<2>t(omega square t) when the centrifugal separation is carried out and the operation is discontinued when the centrifugal amount reaches the given amount, first the centrifugal amount desired by a user is input by omega<2>t(omega square t). When a start switch is on, a motor 1 starts rotating, pulses in proportion to the number of rotations of the motor 1 are transmitted to an operator 4 by an encoder 2 mounted on a motor shaft and a rotating pulse sensor 3. When the rotating angle speed is set as omega and the time is set as t, the computation according to [omegaXomegaXt (user's set value)-omegaXomegaXt (actual passage value)]divided by [omegaXomega (computed value from set number of rotations)] is performed in an operator 4, and as a result, the current omega<2>t(omega square t) value as well as remaining time of operation are displayed simultaneously on an operation state display 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display of the remaining operating time in a centrifuge, and more particularly to a method of displaying the remaining operating time when a user sets a centrifugal amount and operates.

[0002]

2. Description of the Related Art Conventionally, there have been many demands for centrifuging by operating a centrifuge by a certain amount of centrifugation. Therefore, a centrifugal amount is set in a centrifuge and operation is performed until the amount of centrifugation is reached. There is a mode for performing.

Usually, the centrifugal amount is given by ω × ω × t, where ω is the rotational angular velocity and t is the time, and this is called an omega square tee. By multiplying this amount by the radius of gyration, the integrated value of the amount of centrifugation can be obtained, but the radius of gyration cannot be uniquely determined because it depends on the rotor used.
Therefore, the centrifugal condition is set by the value of the omega square tee.

When the set value of the omega square tee is reached, the centrifuge terminates its operation. However, it is difficult for the user to know when to terminate the operation. In addition to the reached value of the tee, there are many things that are displayed together with the remaining operating time.

[0005]

However, conventionally, when the remaining time is calculated by the set omega square tee, the remaining time is calculated from the omega square tee set before the start of the operation and the set operating speed. It calculated how long it would be, subtracted the elapsed time from the time calculated in this way, and calculated and displayed the remaining time.

However, in the actual operation of the centrifuge, the value of the omega square tee calculated from the number of revolutions of the actual centrifuge, that is, the value of the omega square tee set to the set value of 1 is 1
When the number of revolutions of the rotor per second is n, ω = n × 2π, and the operation was stopped when the value of the omega square tee calculated using this value was subtracted and the value became zero.

However, if the calculation is performed in this way, an error will increase and an accurate remaining time cannot be displayed. More specifically, the remaining time can be calculated almost accurately by such a calculation after the operation enters the set rotational speed, but in reality, the rotational speed is gradually increased from 0 immediately after the start of the operation. There are stages, and the value of the Omega square tee at that time is a large deviation from the calculated one.

The error generated in this way is relatively small at the beginning even if the absolute error is the same, and is not noticeable. However, at the end of the process, the difference becomes relatively large and the discrepancy becomes noticeable. What the user wants to know is that the remaining time is not on the order of hours but on the order of minutes, so for example, the centrifuge displayed "5 minutes after", so I went there 5 minutes later. However, it is displayed as "4 minutes after", and after 20 minutes, it means that it is not unfriendly.

When displaying the remaining time, an accurate value must be displayed just before the stop.

[0010]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, and the omega-square tee obtained by counting and calculating inside the centrifuge from the set value of the user's omega-square tee is calculated. The remaining amount of the omega square tee is calculated by subtracting the value, and the remaining amount is divided by the square value of ω calculated by the above formula of ω = n × 2π, that is, [ω × ω
Xt (user set value)-? X? Xt (actual elapsed value)]
÷ The remaining time calculated from [ω × ω (calculated value from the set rotation speed)] is displayed.

[0011]

[Operation] When the remaining time calculated as described above is displayed,
Although the remaining time including many errors is displayed at the beginning of operation, for example, even if the error is 20 minutes, it is the value that the operation time was 4 hours or 5 hours at the beginning, so the error of 20 minutes in that time is I do not mind. However, the error of the remaining time becomes very small after entering the number of revolutions set by the user, and the error of the remaining time becomes infinitely small as the driving approaches the end, as can be seen from the above calculation formula. . That is, when the remaining time reaches several tens of minutes or several minutes, the remaining time can be displayed very accurately.

[0012]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a principle explanatory view showing the principle of the remaining time display method of the present invention. 1 is a drive motor of the centrifuge, 2 is an encoder attached to the rotary shaft of the drive motor 1, 3 is a rotation pulse detector, 4 is a calculator, 5 is an operating state indicator, 6 is a rotor, 7 is a rotor. It is a sample tube to be inserted.

In the method of setting the conditions for centrifuging with the omega square tee and stopping the operation when the centrifuge amount reaches a prescribed amount, first, the user inputs the amount to be centrifuged by the omega square tee. (Not shown). When the start switch is pressed, the motor 1 starts rotating, and the encoder 2 and the rotation pulse detector 3 attached to the motor shaft send a pulse proportional to the rotation speed of the motor 1 to the calculator 4.

In the arithmetic unit 4, [ω × ω × t (user set value) −ω × ω × t (actual elapsed value)] ÷ [ω × ω
(Calculated value from the set rotational speed)], and the result is displayed on the operating state display 5. In the present embodiment, the current value of the omega square tee is displayed in the form of an index display, and at the same time, "** h ** m re" is displayed.
The remaining time of operation is displayed in the form of "maining".

[0015]

As described above, according to the present invention, as the remaining time decreases, the remaining time of operation of the centrifuge can be displayed extremely accurately, so that the information desired by the user can be displayed. To provide convenience.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of a remaining time display method for a centrifuge according to the present invention.

[Explanation of symbols]

1 is a drive motor of the centrifuge, 2 is an encoder attached to the rotary shaft of the drive motor 1, 3 is a rotation pulse detector, 4
Is a computing unit, and 5 is an operating state display. 6 is a rotor, 7
Is a sample tube inserted into the rotor.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Norihisa Sagawa Inventor Norihisa Sagawa 1060 Takeda, Katsuta City, Ibaraki Hitachi Koki Co., Ltd.

Claims (1)

[Claims] 1. In a centrifuge for separating a sample by centrifugal force, when performing centrifugation until a preset centrifugation amount is reached, the centrifugation amount after the centrifugation is performed from the preset centrifugation amount. A method of displaying the remaining time in a centrifuge, characterized by calculating the remaining time of operation by dividing the deducted value by the square of the operating speed and displaying the remaining time obtained.